preliminary, basic hookup of Family Network System base board + MMC1 cassette emulation

This commit is contained in:
g0me3 2020-01-16 21:33:37 +03:00
parent 4fe5da841c
commit 18165938d4
6 changed files with 261 additions and 3 deletions

252
src/boards/fns.cpp Normal file
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@ -0,0 +1,252 @@
/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 1998 BERO
* Copyright (C) 2002 Xodnizel
* Copyright (C) 2020 CaH4e3
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Famicom Network System Base Unit + MMC1 cartridge board
*
*/
#include "mapinc.h"
static uint8 DRegs[4];
static uint8 Buffer, BufferShift;
static uint32 WRAMSIZE;
static uint8 *WRAM = NULL;
static int kanji_pos, kanji_page, r40C0;
static int IRQa, IRQCount;
static DECLFW(MBWRAM) {
if (!(DRegs[3] & 0x10))
Page[A >> 11][A] = V;
}
static DECLFR(MAWRAM) {
if (DRegs[3] & 0x10)
return X.DB;
return(Page[A >> 11][A]);
}
static void MMC1CHR(void) {
setchr8((r40C0 >> 3) & 1);
}
static void MMC1PRG(void) {
uint8 offs_16banks = DRegs[1] & 0x10;
uint8 prg_reg = DRegs[3] & 0xF;
setprg8r(0x10, 0x6000, DRegs[1] & 3);
switch (DRegs[0] & 0xC) {
case 0xC:
setprg16(0x8000, (prg_reg + offs_16banks));
setprg16(0xC000, 0xF + offs_16banks);
break;
case 0x8:
setprg16(0xC000, (prg_reg + offs_16banks));
setprg16(0x8000, offs_16banks);
break;
case 0x0:
case 0x4:
setprg16(0x8000, ((prg_reg & ~1) + offs_16banks));
setprg16(0xc000, ((prg_reg & ~1) + offs_16banks + 1));
break;
}
}
static void MMC1MIRROR(void) {
switch (DRegs[0] & 3) {
case 2: setmirror(MI_V); break;
case 3: setmirror(MI_H); break;
case 0: setmirror(MI_0); break;
case 1: setmirror(MI_1); break;
}
}
static uint64 lreset;
static DECLFW(MMC1_write) {
int n = (A >> 13) - 4;
if ((timestampbase + timestamp) < (lreset + 2))
return;
if (V & 0x80) {
DRegs[0] |= 0xC;
BufferShift = Buffer = 0;
MMC1PRG();
lreset = timestampbase + timestamp;
return;
}
Buffer |= (V & 1) << (BufferShift++);
if (BufferShift == 5) {
DRegs[n] = Buffer;
// FCEU_printf("MMC1 REG%d:%02x\n", n, Buffer);
BufferShift = Buffer = 0;
switch (n) {
case 0: MMC1MIRROR(); // break;
case 1: // break;
// case 2: MMC1CHR(); break;
case 3: MMC1PRG(); break;
}
}
}
static void MMC1_Restore(int version) {
MMC1MIRROR();
MMC1CHR();
MMC1PRG();
lreset = 0;
}
static void MMC1CMReset(void) {
int i;
for (i = 0; i < 4; i++)
DRegs[i] = 0;
Buffer = BufferShift = 0;
DRegs[0] = 0x1F;
DRegs[1] = 0;
DRegs[2] = 0;
DRegs[3] = 0;
MMC1MIRROR();
MMC1CHR();
MMC1PRG();
}
static DECLFW(FNC_cmd_write) {
switch (A) {
case 0x40A6: {
IRQCount = (IRQCount & 0xFF00) | V;
break;
}
case 0x40A7: {
IRQCount = (IRQCount & 0x00FF) | (V << 8);
break;
}
case 0x40A8: {
IRQa = V;
break;
}
case 0x40B0: {
kanji_page = V & 1;
break;
}
case 0x40C0: {
// FCEU_printf("FNS W %04x:%02x\n", A, V);
r40C0 = V;
MMC1CHR();
break;
}
// default:
// FCEU_printf("FNS W %04x:%02x\n", A, V);
}
}
static DECLFR(FNC_stat_read) {
switch (A) {
case 0x40A2: {
int ret = (IRQa >> 1);
X6502_IRQEnd(FCEU_IQEXT);
IRQa = 0;
return ret;
}
case 0x40B0: {
kanji_pos = 0;
return 0;
}
case 0x40C0: {
// FCEU_printf("FNS R %04x\n", A);
int ret = r40C0;
r40C0 &= 0;
return ret;
}
default: {
// FCEU_printf("FNS R %04x\n", A);
return 0xff;
}
}
}
static DECLFR(FNC_kanji_read) {
int32 ofs = ((A & 0xFFF) << 5) + kanji_pos;
kanji_pos++;
kanji_pos &= 0x1F;
// if (PRGptr[1] != NULL) // iNES debug
return PRGptr[1][ofs];
// else
// return CHRptr[0][ofs];
}
void NFC_IRQ(int a) {
if (IRQa) {
IRQCount -= a;
if (IRQCount <= 0)
X6502_IRQBegin(FCEU_IQEXT);
}
}
static void FNS_Power(void) {
lreset = 0;
SetWriteHandler(0x8000, 0xFFFF, MMC1_write);
SetReadHandler(0x8000, 0xFFFF, CartBR);
kanji_page = 0;
kanji_pos = 0;
r40C0 = 0xC0;
SetWriteHandler(0x4080, 0x40FF, FNC_cmd_write);
SetReadHandler(0x4080, 0x40FF, FNC_stat_read);
SetReadHandler(0x5000, 0x5FFF, FNC_kanji_read);
SetReadHandler(0x6000, 0x7FFF, MAWRAM);
SetWriteHandler(0x6000, 0x7FFF, MBWRAM);
FCEU_CheatAddRAM(8, 0x6000, WRAM);
MMC1CMReset();
}
static void FNS_Close(void) {
if (WRAM)
FCEU_gfree(WRAM);
WRAM = NULL;
}
void FNS_Init(CartInfo *info) {
info->Close = FNS_Close;
info->Power = FNS_Power;
GameStateRestore = MMC1_Restore;
MapIRQHook = NFC_IRQ;
WRAMSIZE = (8 + 32) * 1024;
WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
AddExState(WRAM, WRAMSIZE, 0, "WRAM");
info->SaveGame[0] = WRAM;
info->SaveGameLen[0] = WRAMSIZE;
AddExState(DRegs, 4, 0, "DREG");
AddExState(&lreset, 8, 1, "LRST");
AddExState(&Buffer, 1, 1, "BFFR");
AddExState(&BufferShift, 1, 1, "BFRS");
}

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@ -536,7 +536,7 @@ void IncrementInstructionsCounters()
bool CondForbidTest(int bp_num) {
if (bp_num >= 0 && !condition(&watchpoint[bp_num]))
{
return false; // condition rejected
return false; // condition rejected
}
//check to see whether we fall in any forbid zone
@ -550,11 +550,11 @@ bool CondForbidTest(int bp_num) {
{
if (wp.endaddress) {
if ((wp.address <= _PC) && (wp.endaddress >= _PC))
return false; //forbid
return false; // forbid
}
else {
if (wp.address == _PC)
return false; //forbid
return false; // forbid
}
}
}

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@ -472,6 +472,7 @@ static BMAPPING bmap[] = {
{ "80013-B", BMC80013B_Init, 0 },
{ "HPxx", BMCHPxx_Init, 0 },
{ "MINDKIDS", MINDKIDS_Init, BMCFLAG_256KCHRR },
{ "FNS", FNS_Init, BMCFLAG_16KCHRR },
{ 0, 0, 0 }
};

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@ -159,6 +159,7 @@ void BMC8IN1_Init(CartInfo *info);
void BMC80013B_Init(CartInfo *info);
void BMCHPxx_Init(CartInfo *info);
void MINDKIDS_Init(CartInfo *info);
void FNS_Init(CartInfo *info);
extern uint8 *UNIFchrrama; // Meh. So I can stop CHR RAM
// bank switcherooing with certain boards...

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@ -458,6 +458,7 @@
<ClCompile Include="..\src\boards\F-15.cpp" />
<ClCompile Include="..\src\boards\famicombox.cpp" />
<ClCompile Include="..\src\boards\ffe.cpp" />
<ClCompile Include="..\src\boards\fns.cpp" />
<ClCompile Include="..\src\boards\hp10xx_hp20xx.cpp" />
<ClCompile Include="..\src\boards\hp898f.cpp" />
<ClCompile Include="..\src\boards\ks7010.cpp" />

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@ -1099,6 +1099,9 @@
<ClCompile Include="..\src\input\fns.cpp">
<Filter>input</Filter>
</ClCompile>
<ClCompile Include="..\src\boards\fns.cpp">
<Filter>boards</Filter>
</ClCompile>
</ItemGroup>
<ItemGroup>
<ClInclude Include="..\src\drivers\common\args.h">